A models wears a Sue Wong gown at the Riverfront Park fashion show in 2010.

It’s a tribute to organizer Tobie Orr that she was able to sell tickets to her annual Riverfront Park Fashion Show before even revealing what designers’ lines would be on the runway.

This year’s show will be from 5-9 p.m. Aug. 11 and tickets went on sale at a late May kickoff party hosted by the Four Seasons Hotel Denver.

But only on Thursday did Orr say that the event will feature evening wear designs from three top New York labels: Alberto Makali, presented by Mariel, and Tracy Reese and Halston Heritage, to be shown by Garbarini.